pressing keys and Button click simultaneously...

Hi there Guys, I am new in c# and I am trying to learn the key and button functionalities. I created a Pacman-like game with a text twist. So far I can now move pacman and eat pellets. the next step is for him to eat 'letters' and form some words. I created a button TWIST on the form and when I tried moving pacman using the arrow keys he won't move anymore. But when I tried disabling the button TWIST, he moved.

So I think this is somewhat an easy question for you guys, and I don't think I need to provide the code. Just give me some hints on how I can make this right. Thanks in advance guys!

-------

sorry, okay here's the code

for the mouse click event:

 private void twistButton_Click(object sender, EventArgs e)
        {
        //do the twisting

        }

FOr the keydown event:

 private void Form1_KeyDown(object sender, KeyEventArgs k)
        {
         


            string result = k.KeyData.ToString();
            Invalidate(pacman.GetFrame());


            switch (result)
            {
                case "Left":
                    pacman.MoveLeft(ClientRectangle);
                    Invalidate(pacman.GetFrame());
                   
                    break;


                case "Right":
                    pacman.MoveRight(ClientRectangle);
                    Invalidate(pacman.GetFrame());
                    break;


                case "Up":
                    pacman.MoveUp(ClientRectangle);
                    Invalidate(pacman.GetFrame());
                    break;
                case "Down":
                    pacman.MoveDown(ClientRectangle);
                    Invalidate(pacman.GetFrame());
                    break;
                default:
                    break;
            }


           //if pacman eats the gold pellet
            int hitGold = CheckInterSectionGoldPellet();
        //incrementing the time 
            if (hitGold != -1)
            {
                score.Increment();
                Invalidate(((GoldPellet)goldPellets[hitGold]).GetFrame());
                goldPellets.RemoveAt(hitGold);
            }


            //if pacman eats the black pellet
            int hitBlack = CheckInterSectionBlackPellet();
            //incrementing the time
            if (hitBlack != -1)
            {
                score.Increment();
                Invalidate(((BlackPellet)blackPellets[hitBlack]).GetFrame());
                blackPellets.RemoveAt(hitBlack);
            }
        }